Aluminum used to be more valuable than gold!
84
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Cold water weighs more than hot water.
93
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16